CVE-2021-30858
HighExploitedPublic exploitwebkitgtk: Use-after-free leading to arbitrary code execution
Published Oct 13, 2021 · Updated Aug 4, 2026 · Also known as DEBIAN-CVE-2021-30858, TR-21-0762, TR-21-0784, UBUNTU-CVE-2021-30858, USN-5087-1
Key Facts
Patch immediately- CVE-2021-30858 is a high-severity vulnerability (CVSS 8.8 v3.1) affecting Ipados (Apple), Iphone OS (Apple), macOS (Apple) and 22 more products.
- It is exploited in the wild, listed in CISA KEV, Industry KEV feed, CIRCL KEV, ENISA EUVD since Sep 13, 2021. Public exploit code is available.
- EPSS estimates a 13% probability of exploitation in the next 30 days.
- Fixed versions are available, including Ipados 14.8, Iphone OS 12.5.5, macOS 11.6.
- Brandefense priority: patch immediately, because it is listed as exploited in the wild.
CVSS v3.1
8.8
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
EPSS (30-day exploit likelihood)
13%
Higher than 96.3% of all scored CVEs
Exploited in the wild
Yes
4 catalog listings
Public exploit code
Available
Proof-of-concept or weaponized module
Get the full CVE-2021-30858 brief as a PDF
Every affected product and fixed release, exploitation status and a first 24 hours response checklist, emailed within minutes.
Description
A use after free issue was addressed with improved memory management. This issue is fixed in iOS 14.8 and iPadOS 14.8, macOS Big Sur 11.6. Processing maliciously crafted web content may lead to arbitrary code execution. Apple is aware of a report that this issue may have been actively exploited.
Known-Exploited Catalog Listings
| Catalog | Added | Remediation due | Ransomware use |
|---|---|---|---|
| CISA KEV | Nov 3, 2021 | Nov 17, 2021 | Not reported |
| Industry KEV feed | Sep 13, 2021 | Nov 17, 2021 | Not reported |
| CIRCL KEV | Nov 3, 2021 | Nov 17, 2021 | Not reported |
| ENISA EUVD | Nov 3, 2021 | n/a | Not reported |
Required action: Apply updates per vendor instructions.
Affected Products
418 affected entries in total| Product | Affected versions | Fixed in |
|---|---|---|
| IpadosApple | See advisory | 14.8 |
| Iphone OSApple | See advisory | 12.5.5 |
| macOSApple | >= unspecified | 11.6 |
| Debian LinuxDebian | 10.0, 11.0 | n/a |
| FedoraFedoraproject | 33, 34 | n/a |
Patched Releases
Ipados
14.8
Iphone OS
12.5.5
macOS
11.6
iOS
14.8
libjavascriptcoregtk-4_0-18
2.32.4-1.1, 2.32.4-12.3, 2.32.4-2.71.2, 2.32.4-3.82.1, 2.32.4-lp152.2.19.1, 2.34.3-2.82.1, 2.34.3-23.3, 2.34.3-3.92.1
libjavascriptcoregtk-4_0-18-32bit
2.32.4-1.1, 2.32.4-12.3, 2.32.4-lp152.2.19.1, 2.34.3-23.3
libwebkit2gtk-4_0-37
2.32.4-1.1, 2.32.4-12.3, 2.32.4-2.71.2, 2.32.4-3.82.1, 2.32.4-lp152.2.19.1, 2.34.3-2.82.1, 2.34.3-23.3, 2.34.3-3.92.1
libwebkit2gtk-4_0-37-32bit
2.32.4-1.1, 2.32.4-12.3, 2.32.4-lp152.2.19.1, 2.34.3-23.3
libwebkit2gtk3-lang
2.32.4-1.1, 2.32.4-12.3, 2.32.4-2.71.2, 2.32.4-3.82.1, 2.32.4-lp152.2.19.1, 2.34.3-2.82.1, 2.34.3-23.3, 2.34.3-3.92.1
typelib-1_0-JavaScriptCore-4_0
2.32.4-1.1, 2.32.4-12.3, 2.32.4-2.71.2, 2.32.4-3.82.1, 2.32.4-lp152.2.19.1, 2.34.3-2.82.1, 2.34.3-23.3, 2.34.3-3.92.1
typelib-1_0-WebKit2-4_0
2.32.4-1.1, 2.32.4-12.3, 2.32.4-2.71.2, 2.32.4-3.82.1, 2.32.4-lp152.2.19.1, 2.34.3-2.82.1, 2.34.3-23.3, 2.34.3-3.92.1
typelib-1_0-WebKit2WebExtension-4_0
2.32.4-1.1, 2.32.4-12.3, 2.32.4-2.71.2, 2.32.4-3.82.1, 2.32.4-lp152.2.19.1, 2.34.3-2.82.1, 2.34.3-23.3, 2.34.3-3.92.1
webkit-jsc-4
2.32.4-1.1, 2.32.4-12.3, 2.32.4-lp152.2.19.1, 2.34.3-23.3
webkit2gtk
2.32.4-0ubuntu0.18.04.1, 2.32.4-0ubuntu0.20.04.1, 2.32.4-1, 2.32.4-1~deb10u1, 2.32.4-1~deb11u1, 2.32.4-r0
webkit2gtk-4_0-injected-bundles
2.32.4-1.1, 2.32.4-12.3, 2.32.4-2.71.2, 2.32.4-3.82.1, 2.32.4-lp152.2.19.1, 2.34.3-2.82.1, 2.34.3-23.3, 2.34.3-3.92.1
webkit2gtk3
0:2.30.4-3.el8_4, 2.30.4-3.el8_4, 2.32.4-12.3, 2.32.4-2.71.2, 2.32.4-3.82.1, 2.34.2-1.amzn2022, 2.34.3-2.82.1, 2.34.3-23.3, 2.34.3-3.92.1
webkit2gtk3-devel
2.30.4-3.el8_4, 2.32.4-1.1, 2.32.4-12.3, 2.32.4-2.71.2, 2.32.4-3.82.1, 2.32.4-lp152.2.19.1, 2.34.2-1.amzn2022, 2.34.3-2.82.1, 2.34.3-23.3, 2.34.3-3.92.1
webkit2gtk3-doc
2.34.2-1.amzn2022
webkit2gtk3-jsc
2.30.4-3.el8_4, 2.34.2-1.amzn2022
webkit2gtk3-jsc-devel
2.30.4-3.el8_4, 2.34.2-1.amzn2022
webkit2gtk3-minibrowser
2.32.4-1.1, 2.32.4-12.3, 2.32.4-lp152.2.19.1, 2.34.3-23.3
webkitgtk4
0:2.28.2-3.el7, 2.28.2-3.amzn2.0.1, 2.28.2-3.el7
webkitgtk4-devel
2.28.2-3.amzn2.0.1, 2.28.2-3.el7
webkitgtk4-doc
2.28.2-3.amzn2.0.1, 2.28.2-3.el7
webkitgtk4-jsc
2.28.2-3.amzn2.0.1, 2.28.2-3.el7
Timeline
Added to Industry KEV feed
Sep 13, 2021
Publicly disclosed
Oct 13, 2021
Added to CISA KEV
Nov 3, 2021
Added to CIRCL KEV
Nov 3, 2021
Added to ENISA EUVD
Nov 3, 2021
Last updated
Aug 4, 2026
Weakness Type
- CWE-416 Use After Free
References
- advisoryhttp://feedproxy.google.com/~r/TheHackersNews/~3/elwYiDkfEBM/apple-releases-urgent-iphone-and-ipad.html
- advisoryRHSA-2021:4097
- advisoryRHSA-2021:4686
- advisoryRHSA-2022:0059
- advisoryRHSA-2022:0075
FAQ
Common Questions.
A use after free issue was addressed with improved memory management.
Affected: Ipados (Apple); Iphone OS (Apple); macOS (Apple) versions >= unspecified, among others. The full list is in the CVE brief.
It is exploited in the wild, listed in CISA KEV, Industry KEV feed, CIRCL KEV, ENISA EUVD since Sep 13, 2021.
Yes. It was added on Nov 3, 2021 with a federal remediation due date of Nov 17, 2021.
Public exploit code is available.
Fixed versions are available, including Ipados 14.8, Iphone OS 12.5.5, macOS 11.6.
Brandefense priority: patch immediately, because it is listed as exploited in the wild.
Is CVE-2021-30858 Running On Your Attack Surface?
Brandefense maps vulnerabilities like this one to your internet-facing assets and tells you exactly where to patch.
Request A Demo